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Graphene/polymer composite hydrogel thin film and preparation method thereof

A graphene hydrogel and composite hydrogel technology is applied in the field of preparation and application research of graphene hydrogel films, which can solve the problems of inability to exhibit the properties of monolithic graphene and low electrochemical performance.

Inactive Publication Date: 2014-07-02
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because of the serious re-stacking of monolithic layers during this process, the resulting films cannot exhibit the properties of monolithic graphene, and only exhibit low electrochemical performance (see. Qiu L., Yang X.W., Gou X.L., et al. Dispersing Carbon Nanotubes with Graphene Oxide in Water and Synergistic Effects between Graphene Derivatives. Chemistry-A European Journal 2010, 16(35), 10653-10658.)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Step 1: take the graphene aqueous dispersion prepared by redox method as raw material, the graphene aqueous dispersion of 20ml concentration is 0.25mg / ml, carry out suction filtration by the cellulose ester filter membrane that is fixed on the vacuum suction funnel, A circular graphene hydrogel film with a diameter of 4 cm and a thickness of about 10 μm was obtained, and the obtained graphene hydrogel film was soaked in water to remove impurities. Step 2: Transfer and soak the graphene hydrogel film after removing impurities into an aqueous solution dissolved in acrylamide, N,N'-methylenebisacrylamide and potassium persulfate, the concentration of acrylamide is 10%Wt, N , The amount of N'-methylenebisacrylamide is 1%Wt of the amount of acrylamide, the amount of potassium persulfate is 1%Wt of the amount of acrylamide, the soaking time is 24 hours, and it is ready for use after soaking. Step 3: Take the hydrogel film obtained in step 2 out of the solution, transfer it to...

Embodiment 2

[0028] Step 1: take the graphene water dispersion liquid prepared by redox method as raw material, the graphene water dispersion liquid that 25ml concentration is 0.25mg / ml carries out suction filtration through the cellulose ester filter membrane that is fixed on the vacuum suction funnel, obtains A circular graphene hydrogel film with a diameter of 4 cm and a thickness of about 12 μm is soaked in water to remove impurities. Step 2: Transfer and soak the graphene hydrogel film after removing impurities into an aqueous solution dissolved in acrylic acid, N,N'-methylenebisacrylamide and sodium persulfate, the concentration of acrylic acid is 50%Wt, N,N The consumption of '-methylenebisacrylamide is 0.5%Wt of acrylic acid consumption, and the sodium persulfate consumption is 2%Wt of acrylic acid consumption, and soaking time is 48 hours, and it is standby after soaking is completed. Step 3: Take the hydrogel film obtained in step 2 out of the solution, transfer it to a sealed re...

Embodiment 3

[0030] Step 1: take the graphene water dispersion liquid prepared by redox method as raw material, the graphene water dispersion liquid that 15ml concentration is 0.25mg / ml carries out suction filtration by the cellulose ester filter membrane that is fixed on the vacuum suction funnel, obtains A circular graphene hydrogel film with a diameter of 4 cm and a thickness of about 8 μm is soaked in water to remove impurities. Step 2: Transfer and soak the graphene hydrogel film after removing impurities into an aqueous solution dissolved with sodium acrylate, N,N'-methylene bisacrylamide and ammonium persulfate, the concentration of sodium acrylate is 15%Wt, N , The amount of N'-methylene bisacrylamide is 1%Wt of the amount of sodium acrylate, the amount of ammonium persulfate is 2%Wt of the amount of sodium acrylate, after cooling the solution to 5°C, add sodium sulfite, the amount of sodium sulfite is sodium acrylate The dosage is 0.5% Wt, the soaking time is 36 hours at 5°C, and ...

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Abstract

The invention relates to a preparation method of a graphene / polymer composite hydrogel thin film. The method comprises the steps of performing suction filtration on graphene aqueous dispersion to obtain a graphene hydrogel thin film by taking the graphene aqueous dispersion prepared through an oxidation reduction process as a raw material, and performing impurity removal on the prepared graphene hydrogel thin film by soaking; 2) transferring and soaking the graphene hydrogel thin film after impurity removal into an aqueous solution dissolved with polymeric monomers and initiators, and completing soaking for later use; 3) taking out the hydrogel thin film obtained in the step 2) from the solution, transferring into a reaction vessel, performing polymerization reaction by using the polymeric monomers, putting the hydrogel thin film into water after completing the reaction, soaking, and removing the unreacted polymeric monomers and initiators to obtain the graphene / polymer hydrogel thin film. The graphene / hydrophilic polymer composite hydrogel thin film obtained through the preparation method disclosed by the invention ensures that the specific surface area of graphene can maintain a relatively stable value in the composite hydrogel, and has higher application values.

Description

technical field [0001] The invention relates to a preparation method of a graphene / polymer composite hydrogel film, belonging to the field of preparation and application research of the graphene hydrogel film. Background technique [0002] Since Andre K. Heim of the University of Manchester first produced graphene in 2004, its unique properties have attracted countless scientists. It is considered to be the most potential "miracle material" among many new materials, and has very attractive application prospects in the materials and electronics industries. [0003] Graphene is considered as an ideal energy storage material due to its high conductivity and specific surface area, wide electrochemical window and good chemical stability. The theoretical specific surface area of ​​graphene is 2630m 2 / g, higher than activated carbon (see. Stoller M.D., Park S.J., Zhu Y.W., et al. Graphene-Based Ultracapacitors [J]. Nano Letters, 2008, 8, 3498-3502). [0004] There are many meth...

Claims

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Application Information

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IPC IPC(8): C08F220/06C08F220/56C08F222/38C08F2/44C08K7/00C08K3/04
Inventor 吴力立张超灿姚金富文斌周全位
Owner WUHAN UNIV OF TECH
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